Abstract
Abstract Over the last three decades geogrid has been used as a reinforcement in the construction of several earth- retaining and earth-supported structures. In more recent times it has been used as reinforcement of railroad beds to improve its performance and structural integrity. A review of several published field and large-scale laboratory test results relating to the reinforcing ability of geogrids is presented. Also included are a number of case histories from several countries where layer(s) of geogrid were used in ballast and sub-ballast layers and on soft subgrade to reduce track settlement and, hence, the frequency of maintenance.
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